(1)
一般在动词后加-ed。如:play—played, offer—offered, weigh—weighed, destroy— destroyed, sign—signed.
(2)
在以字母e结尾的动词后,只加-d。如:like—liked, provide—provided, hate — hated, date—dated。
(3)
在以“辅音字母+y”结尾的动词后,则改y为i,再加—ed。如:supply—supplied, fly—flied, study— studied. (from http://yingyu.chazidian.com)
(4)
在以单短元音的重读闭音节结尾且,末尾只有一个辅音字母的动词后,双写最后一个辅音字母,再加-ed。如:plan—planned, refer—referred, regret—regretted, ban—banned.
4. 特别说明
有些动词的过去时,如:expect, hope, intend, plan, wanted 等一般过去时,后接不定式的完成时;或它们的过去完成时接不定式的一般式,都可表示过去未曾实现的意图、打算或希望。如:
I hoped to have been invited to his wedding party. —I had hoped to be invited to his wedding ceremony. 我本希望他来邀请我参加他的婚礼。
I intended to have joined their games. —I had intended to join their games. 我本打算参加他们的比赛。
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